diff --git a/2025/src/day09.clj b/2025/src/day09.clj
index 70ca334..c64d7f8 100644
--- a/2025/src/day09.clj
+++ b/2025/src/day09.clj
@@ -1,5 +1,5 @@
 (ns day09
-  (:require input-manager))
+  (:require [input-manager]))
 
 (def input (->> (input-manager/get-input 2025 9)
                 (mapv #(mapv parse-long (re-seq #"\d+" %)))))
@@ -28,10 +28,10 @@
   "Lines AB and CD intersect if points A and B falls on different sides of CD
   and if C and D fall on different sides of AB"
   [[a b] [c d]]
-  (let [o1 (orientation a b c)
-        o2 (orientation a b d)
-        o3 (orientation c d a)
-        o4 (orientation c d b)]
+  (let [o1 (orientation a c b)
+        o2 (orientation a d b)
+        o3 (orientation c a d)
+        o4 (orientation c b d)]
     (and (not= o1 o2) (not= o3 o4))))
 (def line-segments (map vector input (rest input)))
 
@@ -48,5 +48,4 @@
                       (not (some #(intersect? reverse-diag %) segments))))))
      (map (partial apply area))
      sort
-     last)
-
+     last)
\ No newline at end of file